/* * Copyright 2008 Extreme Engineering Solutions, Inc. * * SPDX-License-Identifier: GPL-2.0 */ /* * Driver for DS4510, a CPU supervisor with integrated EEPROM, SRAM, * and 4 programmable non-volatile GPIO pins. */ #include <common.h> #include <i2c.h> #include <command.h> #include <ds4510.h> /* Default to an address that hopefully won't corrupt other i2c devices */ #ifndef CONFIG_SYS_I2C_DS4510_ADDR #define CONFIG_SYS_I2C_DS4510_ADDR (~0) #endif enum { DS4510_CMD_INFO, DS4510_CMD_DEVICE, DS4510_CMD_NV, DS4510_CMD_RSTDELAY, DS4510_CMD_OUTPUT, DS4510_CMD_INPUT, DS4510_CMD_PULLUP, DS4510_CMD_EEPROM, DS4510_CMD_SEEPROM, DS4510_CMD_SRAM, }; /* * Write to DS4510, taking page boundaries into account */ int ds4510_mem_write(uint8_t chip, int offset, uint8_t *buf, int count) { int wrlen; int i = 0; do { wrlen = DS4510_EEPROM_PAGE_SIZE - DS4510_EEPROM_PAGE_OFFSET(offset); if (count < wrlen) wrlen = count; if (i2c_write(chip, offset, 1, &buf[i], wrlen)) return -1; /* * This delay isn't needed for SRAM writes but shouldn't delay * things too much, so do it unconditionally for simplicity */ udelay(DS4510_EEPROM_PAGE_WRITE_DELAY_MS * 1000); count -= wrlen; offset += wrlen; i += wrlen; } while (count > 0); return 0; } /* * General read from DS4510 */ int ds4510_mem_read(uint8_t chip, int offset, uint8_t *buf, int count) { return i2c_read(chip, offset, 1, buf, count); } /* * Write SEE bit in config register. * nv = 0 - Writes to SEEPROM registers behave like EEPROM * nv = 1 - Writes to SEEPROM registers behave like SRAM */ int ds4510_see_write(uint8_t chip, uint8_t nv) { uint8_t data; if (i2c_read(chip, DS4510_CFG, 1, &data, 1)) return -1; if (nv) /* Treat SEEPROM bits as EEPROM */ data &= ~DS4510_CFG_SEE; else /* Treat SEEPROM bits as SRAM */ data |= DS4510_CFG_SEE; return ds4510_mem_write(chip, DS4510_CFG, &data, 1); } /* * Write de-assertion of reset signal delay */ int ds4510_rstdelay_write(uint8_t chip, uint8_t delay) { uint8_t data; if (i2c_read(chip, DS4510_RSTDELAY, 1, &data, 1)) return -1; data &= ~DS4510_RSTDELAY_MASK; data |= delay & DS4510_RSTDELAY_MASK; return ds4510_mem_write(chip, DS4510_RSTDELAY, &data, 1); } /* * Write pullup characteristics of IO pins */ int ds4510_pullup_write(uint8_t chip, uint8_t val) { val &= DS4510_IO_MASK; return ds4510_mem_write(chip, DS4510_PULLUP, (uint8_t *)&val, 1); } /* * Read pullup characteristics of IO pins */ int ds4510_pullup_read(uint8_t chip) { uint8_t val; if (i2c_read(chip, DS4510_PULLUP, 1, &val, 1)) return -1; return val & DS4510_IO_MASK; } /* * Write drive level of IO pins */ int ds4510_gpio_write(uint8_t chip, uint8_t val) { uint8_t data; int i; for (i = 0; i < DS4510_NUM_IO; i++) { if (i2c_read(chip, DS4510_IO0 - i, 1, &data, 1)) return -1; if (val & (0x1 << i)) data |= 0x1; else data &= ~0x1; if (ds4510_mem_write(chip, DS4510_IO0 - i, &data, 1)) return -1; } return 0; } /* * Read drive level of IO pins */ int ds4510_gpio_read(uint8_t chip) { uint8_t data; int val = 0; int i; for (i = 0; i < DS4510_NUM_IO; i++) { if (i2c_read(chip, DS4510_IO0 - i, 1, &data, 1)) return -1; if (data & 1) val |= (1 << i); } return val; } /* * Read physical level of IO pins */ int ds4510_gpio_read_val(uint8_t chip) { uint8_t val; if (i2c_read(chip, DS4510_IO_STATUS, 1, &val, 1)) return -1; return val & DS4510_IO_MASK; } #ifdef CONFIG_CMD_DS4510 #ifdef CONFIG_CMD_DS4510_INFO /* * Display DS4510 information */ static int ds4510_info(uint8_t chip) { int i; int tmp; uint8_t data; printf("DS4510 @ 0x%x:\n\n", chip); if (i2c_read(chip, DS4510_RSTDELAY, 1, &data, 1)) return -1; printf("rstdelay = 0x%x\n\n", data & DS4510_RSTDELAY_MASK); if (i2c_read(chip, DS4510_CFG, 1, &data, 1)) return -1; printf("config = 0x%x\n", data); printf(" /ready = %d\n", data & DS4510_CFG_READY ? 1 : 0); printf(" trip pt = %d\n", data & DS4510_CFG_TRIP_POINT ? 1 : 0); printf(" rst sts = %d\n", data & DS4510_CFG_RESET ? 1 : 0); printf(" /see = %d\n", data & DS4510_CFG_SEE ? 1 : 0); printf(" swrst = %d\n\n", data & DS4510_CFG_SWRST ? 1 : 0); printf("gpio pins: 3210\n"); printf("---------------\n"); printf("pullup "); tmp = ds4510_pullup_read(chip); if (tmp == -1) return tmp; for (i = DS4510_NUM_IO - 1; i >= 0; i--) printf("%d", (tmp & (1 << i)) ? 1 : 0); printf("\n"); printf("driven "); tmp = ds4510_gpio_read(chip); if (tmp == -1) return -1; for (i = DS4510_NUM_IO - 1; i >= 0; i--) printf("%d", (tmp & (1 << i)) ? 1 : 0); printf("\n"); printf("read "); tmp = ds4510_gpio_read_val(chip); if (tmp == -1) return -1; for (i = DS4510_NUM_IO - 1; i >= 0; i--) printf("%d", (tmp & (1 << i)) ? 1 : 0); printf("\n"); return 0; } #endif /* CONFIG_CMD_DS4510_INFO */ cmd_tbl_t cmd_ds4510[] = { U_BOOT_CMD_MKENT(device, 3, 0, (void *)DS4510_CMD_DEVICE, "", ""), U_BOOT_CMD_MKENT(nv, 3, 0, (void *)DS4510_CMD_NV, "", ""), U_BOOT_CMD_MKENT(output, 4, 0, (void *)DS4510_CMD_OUTPUT, "", ""), U_BOOT_CMD_MKENT(input, 3, 0, (void *)DS4510_CMD_INPUT, "", ""), U_BOOT_CMD_MKENT(pullup, 4, 0, (void *)DS4510_CMD_PULLUP, "", ""), #ifdef CONFIG_CMD_DS4510_INFO U_BOOT_CMD_MKENT(info, 2, 0, (void *)DS4510_CMD_INFO, "", ""), #endif #ifdef CONFIG_CMD_DS4510_RST U_BOOT_CMD_MKENT(rstdelay, 3, 0, (void *)DS4510_CMD_RSTDELAY, "", ""), #endif #ifdef CONFIG_CMD_DS4510_MEM U_BOOT_CMD_MKENT(eeprom, 6, 0, (void *)DS4510_CMD_EEPROM, "", ""), U_BOOT_CMD_MKENT(seeprom, 6, 0, (void *)DS4510_CMD_SEEPROM, "", ""), U_BOOT_CMD_MKENT(sram, 6, 0, (void *)DS4510_CMD_SRAM, "", ""), #endif }; int do_ds4510(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { static uint8_t chip = CONFIG_SYS_I2C_DS4510_ADDR; cmd_tbl_t *c; ulong ul_arg2 = 0; ulong ul_arg3 = 0; int tmp; #ifdef CONFIG_CMD_DS4510_MEM ulong addr; ulong off; ulong cnt; int end; int (*rw_func)(uint8_t, int, uint8_t *, int); #endif c = find_cmd_tbl(argv[1], cmd_ds4510, ARRAY_SIZE(cmd_ds4510)); /* All commands but "device" require 'maxargs' arguments */ if (!c || !((argc == (c->maxargs)) || (((int)c->cmd == DS4510_CMD_DEVICE) && (argc == (c->maxargs - 1))))) { return cmd_usage(cmdtp); } /* arg2 used as chip addr and pin number */ if (argc > 2) ul_arg2 = simple_strtoul(argv[2], NULL, 16); /* arg3 used as output/pullup value */ if (argc > 3) ul_arg3 = simple_strtoul(argv[3], NULL, 16); switch ((int)c->cmd) { case DS4510_CMD_DEVICE: if (argc == 3) chip = ul_arg2; printf("Current device address: 0x%x\n", chip); return 0; case DS4510_CMD_NV: return ds4510_see_write(chip, ul_arg2); case DS4510_CMD_OUTPUT: tmp = ds4510_gpio_read(chip); if (tmp == -1) return -1; if (ul_arg3) tmp |= (1 << ul_arg2); else tmp &= ~(1 << ul_arg2); return ds4510_gpio_write(chip, tmp); case DS4510_CMD_INPUT: tmp = ds4510_gpio_read_val(chip); if (tmp == -1) return -1; return (tmp & (1 << ul_arg2)) != 0; case DS4510_CMD_PULLUP: tmp = ds4510_pullup_read(chip); if (tmp == -1) return -1; if (ul_arg3) tmp |= (1 << ul_arg2); else tmp &= ~(1 << ul_arg2); return ds4510_pullup_write(chip, tmp); #ifdef CONFIG_CMD_DS4510_INFO case DS4510_CMD_INFO: return ds4510_info(chip); #endif #ifdef CONFIG_CMD_DS4510_RST case DS4510_CMD_RSTDELAY: return ds4510_rstdelay_write(chip, ul_arg2); #endif #ifdef CONFIG_CMD_DS4510_MEM case DS4510_CMD_EEPROM: end = DS4510_EEPROM + DS4510_EEPROM_SIZE; off = DS4510_EEPROM; break; case DS4510_CMD_SEEPROM: end = DS4510_SEEPROM + DS4510_SEEPROM_SIZE; off = DS4510_SEEPROM; break; case DS4510_CMD_SRAM: end = DS4510_SRAM + DS4510_SRAM_SIZE; off = DS4510_SRAM; break; #endif default: /* We should never get here... */ return 1; } #ifdef CONFIG_CMD_DS4510_MEM /* Only eeprom, seeprom, and sram commands should make it here */ if (strcmp(argv[2], "read") == 0) rw_func = ds4510_mem_read; else if (strcmp(argv[2], "write") == 0) rw_func = ds4510_mem_write; else return cmd_usage(cmdtp); addr = simple_strtoul(argv[3], NULL, 16); off += simple_strtoul(argv[4], NULL, 16); cnt = simple_strtoul(argv[5], NULL, 16); if ((off + cnt) > end) { printf("ERROR: invalid len\n"); return -1; } return rw_func(chip, off, (uint8_t *)addr, cnt); #endif } U_BOOT_CMD( ds4510, 6, 1, do_ds4510, "ds4510 eeprom/seeprom/sram/gpio access", "device [dev]\n" " - show or set current device address\n" #ifdef CONFIG_CMD_DS4510_INFO "ds4510 info\n" " - display ds4510 info\n" #endif "ds4510 output pin 0|1\n" " - set pin low or high-Z\n" "ds4510 input pin\n" " - read value of pin\n" "ds4510 pullup pin 0|1\n" " - disable/enable pullup on specified pin\n" "ds4510 nv 0|1\n" " - make gpio and seeprom writes volatile/non-volatile" #ifdef CONFIG_CMD_DS4510_RST "\n" "ds4510 rstdelay 0-3\n" " - set reset output delay" #endif #ifdef CONFIG_CMD_DS4510_MEM "\n" "ds4510 eeprom read addr off cnt\n" "ds4510 eeprom write addr off cnt\n" " - read/write 'cnt' bytes at EEPROM offset 'off'\n" "ds4510 seeprom read addr off cnt\n" "ds4510 seeprom write addr off cnt\n" " - read/write 'cnt' bytes at SRAM-shadowed EEPROM offset 'off'\n" "ds4510 sram read addr off cnt\n" "ds4510 sram write addr off cnt\n" " - read/write 'cnt' bytes at SRAM offset 'off'" #endif ); #endif /* CONFIG_CMD_DS4510 */